Which of the following happens when a reaction reaches dynamic equilibrium in a closed system? (5 points) A. Reaction stops. B. Reaction happens in both directions. C. The concentrations of the reactants and products increase. D. The concentrations of the reactants and products decrease.

B Reaction happens in both directions.

B. Reaction happens in both directions!

Explanation:

Dynamic equilibrium is reached once a reaction becomes reversible -- meaning that, when a reaction is in dynamic equilibrium, the forward reaction rate and the backward reaction rate, are equal or occurring at the same time!

Equilibrium is really just like saying they're [the reactions] at a point where they're both "balanced" and so they're equal, nothing is changing and they're going equally both ways!  (This is just for explanatory reasons, but "balanced" isn't the correct term to use for dynamic equilibrium, as it is used for other things in Chemistry!)

Hope this helps a little! [And that I didn't confuse you!] :)

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

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